e.
vSphere Client (Connect to the ESXi server in a web browser to download the client)

2) Temporarily Enable SSH

a. We don’t recommend leaving SSH on permanently. SSH can be temporarily enabled via the ESXi vSphere. Step-by-step instructions can be found at:
http://www.thomasmaurer.ch/2011/08/enable-ssh-on-esxi-5-via-vsphere-client/

3) Put the ESXi system into maintenance mode

a.
Make sure you have all of your VM’s backed up somewhere else just in case. While we have never had any corruption during an upgrade, it’s always wise
to have quality backups prior to an upgrade.

4) Patch ESXi 5.0

NOTE: You will receive errors such as ERRORNO 39 when upgrading if you do not have current patches installed prior to upgrading.